US20020108249A1 - Method for producing a bicycle wheel rim, apparatus for implementing the method and bicycle wheel rim obtained thereby - Google Patents
Method for producing a bicycle wheel rim, apparatus for implementing the method and bicycle wheel rim obtained thereby Download PDFInfo
- Publication number
- US20020108249A1 US20020108249A1 US10/073,411 US7341102A US2002108249A1 US 20020108249 A1 US20020108249 A1 US 20020108249A1 US 7341102 A US7341102 A US 7341102A US 2002108249 A1 US2002108249 A1 US 2002108249A1
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- Prior art keywords
- layers
- mould
- rim
- wings
- peripheral wall
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Links
- 238000000034 method Methods 0.000 title claims description 66
- 238000004519 manufacturing process Methods 0.000 title claims description 12
- 230000002093 peripheral effect Effects 0.000 claims abstract description 88
- 239000000463 material Substances 0.000 claims abstract description 80
- 239000000835 fiber Substances 0.000 claims abstract description 40
- 238000004873 anchoring Methods 0.000 claims abstract description 38
- 239000004033 plastic Substances 0.000 claims description 27
- 229920003023 plastic Polymers 0.000 claims description 27
- 239000004744 fabric Substances 0.000 claims description 26
- 239000011159 matrix material Substances 0.000 claims description 23
- 238000000465 moulding Methods 0.000 claims description 22
- 238000005304 joining Methods 0.000 claims description 17
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 12
- 229910052799 carbon Inorganic materials 0.000 claims description 12
- 230000000916 dilatatory effect Effects 0.000 claims description 8
- 230000010339 dilation Effects 0.000 claims description 7
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 7
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 5
- 229910052796 boron Inorganic materials 0.000 claims description 5
- 239000000919 ceramic Substances 0.000 claims description 5
- 239000003365 glass fiber Substances 0.000 claims description 5
- 238000003754 machining Methods 0.000 claims description 5
- 229920001296 polysiloxane Polymers 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 3
- 229920001903 high density polyethylene Polymers 0.000 claims description 3
- 239000002033 PVDF binder Substances 0.000 claims description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 2
- 229920001187 thermosetting polymer Polymers 0.000 claims description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 claims 2
- 229920002493 poly(chlorotrifluoroethylene) Polymers 0.000 claims 1
- 239000005023 polychlorotrifluoroethylene (PCTFE) polymer Substances 0.000 claims 1
- 238000003825 pressing Methods 0.000 claims 1
- 229920000049 Carbon (fiber) Polymers 0.000 abstract 1
- 239000004917 carbon fiber Substances 0.000 abstract 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract 1
- DOSMHBDKKKMIEF-UHFFFAOYSA-N 2-[3-(diethylamino)-6-diethylazaniumylidenexanthen-9-yl]-5-[3-[3-[4-(1-methylindol-3-yl)-2,5-dioxopyrrol-3-yl]indol-1-yl]propylsulfamoyl]benzenesulfonate Chemical compound C1=CC(=[N+](CC)CC)C=C2OC3=CC(N(CC)CC)=CC=C3C(C=3C(=CC(=CC=3)S(=O)(=O)NCCCN3C4=CC=CC=C4C(C=4C(NC(=O)C=4C=4C5=CC=CC=C5N(C)C=4)=O)=C3)S([O-])(=O)=O)=C21 DOSMHBDKKKMIEF-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- HQQADJVZYDDRJT-UHFFFAOYSA-N ethene;prop-1-ene Chemical class C=C.CC=C HQQADJVZYDDRJT-UHFFFAOYSA-N 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
- B29C70/44—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using isostatic pressure, e.g. pressure difference-moulding, vacuum bag-moulding, autoclave-moulding or expanding rubber-moulding
- B29C70/446—Moulding structures having an axis of symmetry or at least one channel, e.g. tubular structures, frames
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B21/00—Rims
- B60B21/02—Rims characterised by transverse section
- B60B21/025—Rims characterised by transverse section the transverse section being hollow
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B21/00—Rims
- B60B21/06—Rims characterised by means for attaching spokes, i.e. spoke seats
- B60B21/062—Rims characterised by means for attaching spokes, i.e. spoke seats for bicycles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B21/00—Rims
- B60B21/12—Appurtenances, e.g. lining bands
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B25/00—Rims built-up of several main parts ; Locking means for the rim parts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B5/00—Wheels, spokes, disc bodies, rims, hubs, wholly or predominantly made of non-metallic material
- B60B5/02—Wheels, spokes, disc bodies, rims, hubs, wholly or predominantly made of non-metallic material made of synthetic material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
- B29L2031/3091—Bicycles
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49544—Roller making
- Y10T29/4956—Fabricating and shaping roller work contacting surface element
Definitions
- This invention relates to bicycle wheel rims of the type presenting a peripheral inner wall, a peripheral outer wall, two lateral walls joining said peripheral walls and two circumferential wings for anchoring a tire which radially extend outwards from the two sides of the outer peripheral wall.
- This invention also relates to a method for producing a rim of the type described above.
- the object of this invention is to overcome this technical problem.
- this invention relates to a rim for a bicycle wheel, comprising an inner peripheral wall, an outer peripheral wall, two lateral walls joining said peripheral walls, and two circumferential wings for anchoring a tire which radially extend outwards from the two sides of the outer peripheral wall, wherein said rim is made of a single part of structural fibre based material incorporating the two circumferential wings.
- This invention relates also to a method for producing a bicycle wheel rim of the type presenting an inner peripheral wall, an outer peripheral wall, two lateral walls joining said peripheral walls , and two circumferential wings, for anchoring a tire, which extend outwards from the two sides of the outer peripheral wall,
- the cores are made of a material with a thermal dilation coefficient exceeding 5 ⁇ 10 ⁇ 5 mm/° C., the moulding process comprising an increase in temperature to a value sufficient to cause the material of said cores to dilate so as to press the layers of fabric forming the tire anchoring wings against the wall of the mould.
- the material forming the cores has a thermal dilation coefficient exceeding 9 ⁇ 10 ⁇ 5 mm/° C. and a maximum continuous thermal resistance temperature exceeding 100° C.
- the material forming the core can be either PTFE (polytetrafluoroethene), or FEP (fluorinated ethene propene), or PCTFE (polychlorotrifluoroethene), or PVDF (polyfluorodivinylidene), or PE-HD (high density polyethylene).
- PTFE polytetrafluoroethene
- FEP fluorinated ethene propene
- PCTFE polychlorotrifluoroethene
- PVDF polyfluorodivinylidene
- PE-HD high density polyethylene
- This material presents the characteristic of being subject to high thermal dilation at relatively low temperatures, in the order of temperatures at which the plastic material in which the structural fibre fabric is incorporated reticulates.
- Structural fibre fabrics incorporated in a plastic material matrix are known and have been used for some time. They are made with yarn obtained from structural fibres, such as carbon fibres, for example. These fabrics are then subjected to an impregnation method to associate them with a plastic material matrix, typically a thermosetting plastic material.
- two ring-shaped cores of said thermally dilating material are used, each split into several sectors if required, which are arranged so as to be spaced from each other around the layers which are to form the peripheral external wall of the rim, each core supporting one of the two tire anchoring wings.
- the space comprised between said two rings is filled by one wall of the mould.
- this space is filled by a third core, which is also a ring formed by several sectors, made of thermally dilating material.
- the cores being split into several sectors allows easy removal of said cores from the part obtained at the end of the moulding process, after opening the mould, despite the undercut conformation of the two tire anchoring wings.
- the core is a silicone sheath made in a single continuous piece or in sectors centered by a projection of the outer mould.
- the rim can initially be moulded with anchoring wings which are longer than required. In this case, after the moulding process, mechanical machining is carried out to reduce the wings to the required dimensions.
- This method also has the advantage of preventing superficial defects, which may be present on the circumferential edges of the two wings at the end of the moulding process. This method is an invention in its own right, regardless of the type of moulding process used.
- the invention is also directed to the apparatus for carrying out the above described method as well as to the bicycle wheel rim per se.
- the features of the apparatus and the rim of the invention are also set forth in the appended claims.
- FIGS. 1, 2 and 3 illustrate three different phases of a moulding method of a bicycle rim according to this invention
- FIGS. 4, 5 illustrate two different phases of the method according to this invention, with the use of a modified mould with respect to the one shown in FIGS. 1 - 3 ,
- FIG. 6 illustrates the end product, which can be obtained either with the mould in FIGS. 1 - 3 or with the mould of FIGS. 4, 5, after final mechanical machining required to reduce the tire anchoring wings to the required dimensions,
- FIG. 7 illustrates a perspective exploded view of a phase of the method
- FIG. 8 is a variant of FIG. 5, and
- FIGS. 9,10 show two further variants.
- the method according to this invention is used to make a rim 1 for a bicycle wheel, which cross section is shown in the figure.
- the rim comprises an outer peripheral wall 2 , an inner peripheral wall 3 , two lateral walls 4 , 5 joining the peripheral walls 2 , 3 and defining a closed circumferential cavity 50 with the peripheral walls 2 , 3 , and two circumferential wings 6 for anchoring a tire, which extend radially outwards towards the sides of the outer peripheral wall 2 .
- the rim 1 made with the method according to this invention presents a body made of a single part made of structural fibre based material, preferably carbon fibre material.
- a plastic material bag 7 is arranged inside the cavity 50 , for the reasons illustrated below.
- FIGS. 1 - 3 show three subsequent phases of the method according to this invention, with the use of a first type of mould.
- the mould used for moulding the rim comprises two inner elements 8 and an outer element 9 .
- the inner elements 8 are circumferential elements which overlap on a plane 8 a . They define a circumferential surface 11 destined to delimit, as shown in FIG. 3, the outer surface of the inner peripheral wall and the two sides of the rim.
- a number of layers 12 of the structural fibre based fabric for example carbon fibre fabric, incorporated in a plastic material matrix, are arranged on the surface 11 , but the structural fibres can be selected among carbon fibres, glass fibres, aramidic fibres, boron fibres, ceramic fibres or any combinations thereof.
- the arranged layers 12 are destined to assume the conformation shown in FIG. 1. Firstly, the layers 12 are arranged on the surface 11 so to present sections 12 radially extending outwards from the mould elements 8 , which are arranged in the position illustrated with the dotted line. An inflatable bag made of plastic material 13 is then arranged on the layers.
- the bag is equipped with an inflating valve (not shown), which communicates externally to the mould by means of a passage (not shown in the figures).
- the purpose of the inflatable bag 13 is to press the layers of fabric 12 against the walls of the mould during the moulding process while the mould is closed.
- a certain number 12 a of the projecting sections of the layers of fabric 12 are partially folded back, over the bag 13 and another number 12 b is left free to form edges destined to make the circumferential tire anchoring wings 6 .
- additional layers C can be applied on the layers 12 positioned over the bag 13 , to achieve any required thickness of the external peripheral wall 2 of the rim, and/or of wings 6 .
- additional layers D can also be applied to fill the side regions of the outer wall of the rim.
- two cores 14 each made of a ring which may be split into several sections (for example into three sections) 15 , to facilitate the subsequent extraction of the cores 14 from the mould, are arranged over the layers 12 destined to form the outer peripheral wall 2 of the rim.
- the two rings 15 are arranged over the layers 12 , destined to form the wall 2 , in a reciprocally distanced position, so to allow folding one of the edges 12 b on it in order to make the tire anchoring wings 6 (see FIG. 2).
- the space between the two rings 14 is filled by a circumferential ribbing 16 of the outer element 9 of the mould, as shown in FIGS. 2, 3 (the latter figure shows the mould in the closed condition with the bag inflated).
- the material forming the cores 14 is a material presenting a relatively high thermal dilation coefficient, such as PTFE, for example.
- the mould is thus closed with the layers 12 arranged inside, placed in an oven and subjected to a heating and cooling cycle so to cause the reticulation of the plastic material matrix in which the carbon fibre fabrics are incorporated, on one hand, and the thermal dilation of the cores 14 , on the other hand, to press the layers of fabric 12 b against the walls of the mould.
- the pressure required to make the outer and inner peripheral walls and the sides of the rim is ensured by letting pressurised air into the inflatable bag 13 .
- the temperature to which the mould must be taken in order to complete the process is preferably comprised in the range from 80° C. to 200° C.
- the mould is preferably maintained at a temperature in this range for a time comprised in the range from 10 minutes to three hours, preferably from 30 minutes to three hours.
- FIG. 9 shows a further variant in which a single core 14 is provided in form of a silicone sheath made in a single continuous piece or in sectors. This sheath is deformable and kept in a centered position by a projection 140 of the outer mould. At the end of the process the silicone sheath is extracted with the aid of pliers.
- the edges 12 b of the layers destined to form the wings 6 are arranged to form a length exceeding the required dimensions. Consequently, at the end of the moulding process, the parts are mechanically machined to reduce the wings 6 to the required length and/or shape.
- the method also has the advantage of eliminating any surface defects which may be present on the ends of the edges 12 b at the end of the moulding process in the mould. This characteristic can be used regardless of the moulding process used, and is consequently an invention in its own right.
- FIGS. 4, 5 illustrate a second type of mould in the open condition and in the closed condition.
- the space comprised between the two ring-shaped cores 14 is occupied by a third ring-shaped core 17 , also made of high thermal dilating material, for example PTFE.
- FIG. 10 shows the case of a rim with asymmetrical cross-section obtained according to the principles of the present invention.
- the layers of fibre fabric material include first layers A extending so as to contribute to define the inner wall, the side walls and the two wings of the rim, second layers B arranged so as to contribute to define the inner, side and outer walls of the rim, third layers C arranged to define the outer wall and the two wings of the rim, and fourth layers D wound to fill the side regions of the outer wall of the rim from which the wings depart.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Materials Engineering (AREA)
- Moulding By Coating Moulds (AREA)
- Tires In General (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Forging (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Golf Clubs (AREA)
Abstract
Description
- This invention relates to bicycle wheel rims of the type presenting a peripheral inner wall, a peripheral outer wall, two lateral walls joining said peripheral walls and two circumferential wings for anchoring a tire which radially extend outwards from the two sides of the outer peripheral wall.
- This invention also relates to a method for producing a rim of the type described above.
- The Applicant has recently conducted various studies and tests to make bicycle wheel rims using structural fibre based material, typically carbon fibre based material. The advantage offered by this type of material is that of being light in weight with respect to the metallic materials used in the past given equal structural characteristics. Making a rim out of a single part of carbon fibre based material was difficult, at least utilising the technologies available at that time, due to the typical conformation of the circumferential anchoring wings of the tire. Typically, these wings present peripheral outer edges folded one towards the other thus creating an undercut, which causes the moulding problems.
- The object of this invention is to overcome this technical problem.
- In order to attain this object, this invention relates to a rim for a bicycle wheel, comprising an inner peripheral wall, an outer peripheral wall, two lateral walls joining said peripheral walls, and two circumferential wings for anchoring a tire which radially extend outwards from the two sides of the outer peripheral wall, wherein said rim is made of a single part of structural fibre based material incorporating the two circumferential wings.
- This invention relates also to a method for producing a bicycle wheel rim of the type presenting an inner peripheral wall, an outer peripheral wall, two lateral walls joining said peripheral walls , and two circumferential wings, for anchoring a tire, which extend outwards from the two sides of the outer peripheral wall,
- wherein it comprises the following steps:
- applying on the inner part of a mould a predetermined number of layers of structural fibre fabric incorporated in a plastic material matrix which are to form the inner wall, the outer wall, the two lateral walls and the wings;
- arranging an inflatable bag on the layers;
- folding a first predetermined number of the layers on the inflatable bag,;
- applying at least one core over the folded first predetermined number of layers;
- folding a second predetermined number of the layers over the core;
- applying the outer part of the mould so as to enclose the layers;
- inflating the inflatable bag so as to press the layers against the mould;
- increasing the temperature of the mould to a value sufficient to cause reticulation of the plastic material matrix;
- removing the bicycle wheel rim from the mould and removing the core, so as to obtain a bicycle wheel rim formed of a single piece of structural fibre material.
- The cores are made of a material with a thermal dilation coefficient exceeding5×10 −5 mm/° C., the moulding process comprising an increase in temperature to a value sufficient to cause the material of said cores to dilate so as to press the layers of fabric forming the tire anchoring wings against the wall of the mould.
- Preferably, the material forming the cores has a thermal dilation coefficient exceeding9×10 −5 mm/° C. and a maximum continuous thermal resistance temperature exceeding 100° C.
- Again preferably, the material forming the core can be either PTFE (polytetrafluoroethene), or FEP (fluorinated ethene propene), or PCTFE (polychlorotrifluoroethene), or PVDF (polyfluorodivinylidene), or PE-HD (high density polyethylene).
- The use of PTFE is widely preferred, due to the anti-adherence properties of this material, which are useful for detaching the core, or cores, from the structural fibre moulded body, as well as its high continuous thermal resistance (260° C.), for its good thermal conductivity (0.25 W/m° C.) and for its good thermal capacity (specific heat), equal to 1.045 Kj/kg° C.
- This material presents the characteristic of being subject to high thermal dilation at relatively low temperatures, in the order of temperatures at which the plastic material in which the structural fibre fabric is incorporated reticulates.
- Structural fibre fabrics incorporated in a plastic material matrix are known and have been used for some time. They are made with yarn obtained from structural fibres, such as carbon fibres, for example. These fabrics are then subjected to an impregnation method to associate them with a plastic material matrix, typically a thermosetting plastic material.
- According to an additional preferred embodiment of this invention, two ring-shaped cores of said thermally dilating material are used, each split into several sectors if required, which are arranged so as to be spaced from each other around the layers which are to form the peripheral external wall of the rim, each core supporting one of the two tire anchoring wings.
- In a first embodiment, the space comprised between said two rings is filled by one wall of the mould. In a second form of embodiment, this space is filled by a third core, which is also a ring formed by several sectors, made of thermally dilating material. The cores being split into several sectors allows easy removal of said cores from the part obtained at the end of the moulding process, after opening the mould, despite the undercut conformation of the two tire anchoring wings. In a third embodiment, the core is a silicone sheath made in a single continuous piece or in sectors centered by a projection of the outer mould.
- As shown above, the application of the required pressure inside the mould on the layers destined to form the outer and inner peripheral walls of the rim, as well as the two lateral walls of the rim, is obtained by arranging an inflatable bag in the cavity between these layers. The bag can remain inside the part after the end of the moulding process. This technique was previously tested by the Applicant for making rims of the type above without tire anchoring wings. This technique cannot be used in a similar fashion for making said anchoring wings in rims of the type comprising said wings. For this reason, the Applicant has additionally developed studies to create this invention.
- According to an additional preferred characteristic of this invention, the rim can initially be moulded with anchoring wings which are longer than required. In this case, after the moulding process, mechanical machining is carried out to reduce the wings to the required dimensions. This method also has the advantage of preventing superficial defects, which may be present on the circumferential edges of the two wings at the end of the moulding process. This method is an invention in its own right, regardless of the type of moulding process used.
- Further features of the method of the invention are indicated in the claims.
- The invention is also directed to the apparatus for carrying out the above described method as well as to the bicycle wheel rim per se. The features of the apparatus and the rim of the invention are also set forth in the appended claims.
- This invention will be better explained by the following detailed descriptions with reference to the accompanying figures as non-limiting examples, whereas:
- FIGS. 1, 2 and3 illustrate three different phases of a moulding method of a bicycle rim according to this invention,
- FIGS. 4, 5 illustrate two different phases of the method according to this invention, with the use of a modified mould with respect to the one shown in FIGS.1-3,
- FIG. 6 illustrates the end product, which can be obtained either with the mould in FIGS.1-3 or with the mould of FIGS. 4, 5, after final mechanical machining required to reduce the tire anchoring wings to the required dimensions,
- FIG. 7 illustrates a perspective exploded view of a phase of the method,
- FIG. 8 is a variant of FIG. 5, and
- FIGS. 9,10 show two further variants.
- With reference to FIG. 6, the method according to this invention is used to make a rim1 for a bicycle wheel, which cross section is shown in the figure. The rim comprises an outer peripheral wall 2, an inner peripheral wall 3, two
lateral walls circumferential cavity 50 with the peripheral walls 2, 3, and twocircumferential wings 6 for anchoring a tire, which extend radially outwards towards the sides of the outer peripheral wall 2. As mentioned above, the rim 1 made with the method according to this invention presents a body made of a single part made of structural fibre based material, preferably carbon fibre material. Aplastic material bag 7 is arranged inside thecavity 50, for the reasons illustrated below. - FIGS.1-3 show three subsequent phases of the method according to this invention, with the use of a first type of mould. In this case, the mould used for moulding the rim comprises two
inner elements 8 and anouter element 9. Theinner elements 8 are circumferential elements which overlap on a plane 8 a. They define acircumferential surface 11 destined to delimit, as shown in FIG. 3, the outer surface of the inner peripheral wall and the two sides of the rim. In order to form the rim, a number oflayers 12 of the structural fibre based fabric, for example carbon fibre fabric, incorporated in a plastic material matrix, are arranged on thesurface 11 , but the structural fibres can be selected among carbon fibres, glass fibres, aramidic fibres, boron fibres, ceramic fibres or any combinations thereof. The arrangedlayers 12 are destined to assume the conformation shown in FIG. 1. Firstly, thelayers 12 are arranged on thesurface 11 so to presentsections 12 radially extending outwards from themould elements 8, which are arranged in the position illustrated with the dotted line. An inflatable bag made ofplastic material 13 is then arranged on the layers. The bag is equipped with an inflating valve (not shown), which communicates externally to the mould by means of a passage (not shown in the figures). The purpose of theinflatable bag 13 is to press the layers offabric 12 against the walls of the mould during the moulding process while the mould is closed. Again with reference to FIG. 1, after positioning theplastic material bag 13, acertain number 12 a of the projecting sections of the layers offabric 12 are partially folded back, over thebag 13 and anothernumber 12 b is left free to form edges destined to make the circumferentialtire anchoring wings 6. Naturally, additional layers C can be applied on thelayers 12 positioned over thebag 13, to achieve any required thickness of the external peripheral wall 2 of the rim, and/or ofwings 6. Further, additional layers D can also be applied to fill the side regions of the outer wall of the rim. - Again with reference to FIG. 1 and also to FIG. 7, two
cores 14, each made of a ring which may be split into several sections (for example into three sections) 15, to facilitate the subsequent extraction of thecores 14 from the mould, are arranged over thelayers 12 destined to form the outer peripheral wall 2 of the rim. The two rings 15 are arranged over thelayers 12, destined to form the wall 2, in a reciprocally distanced position, so to allow folding one of theedges 12 b on it in order to make the tire anchoring wings 6 (see FIG. 2). In the form of embodiment shown in FIGS. 1-3, the space between the tworings 14 is filled by acircumferential ribbing 16 of theouter element 9 of the mould, as shown in FIGS. 2, 3 (the latter figure shows the mould in the closed condition with the bag inflated). - As extensively described above, the material forming the
cores 14 is a material presenting a relatively high thermal dilation coefficient, such as PTFE, for example. The mould is thus closed with thelayers 12 arranged inside, placed in an oven and subjected to a heating and cooling cycle so to cause the reticulation of the plastic material matrix in which the carbon fibre fabrics are incorporated, on one hand, and the thermal dilation of thecores 14, on the other hand, to press the layers offabric 12 b against the walls of the mould. The pressure required to make the outer and inner peripheral walls and the sides of the rim is ensured by letting pressurised air into theinflatable bag 13. The temperature to which the mould must be taken in order to complete the process is preferably comprised in the range from 80° C. to 200° C. The mould is preferably maintained at a temperature in this range for a time comprised in the range from 10 minutes to three hours, preferably from 30 minutes to three hours. - After the moulding process, a cooling phase follows, then the mould is opened and the
cores 14 are removed. - It is important to note that any number, conformation and arrangement of cores used for moulding the
wings 6 can be used, also entirely different from the cores illustrated in the drawings provided as non-limiting examples. The case of a single core made of deformable material may also be envisaged to allow extraction from the mould (FIG. 8). FIG. 9 shows a further variant in which asingle core 14 is provided in form of a silicone sheath made in a single continuous piece or in sectors. This sheath is deformable and kept in a centered position by aprojection 140 of the outer mould. At the end of the process the silicone sheath is extracted with the aid of pliers. - According to an additional important characteristic of the invention, the
edges 12 b of the layers destined to form thewings 6 are arranged to form a length exceeding the required dimensions. Consequently, at the end of the moulding process, the parts are mechanically machined to reduce thewings 6 to the required length and/or shape. The method also has the advantage of eliminating any surface defects which may be present on the ends of theedges 12 b at the end of the moulding process in the mould. This characteristic can be used regardless of the moulding process used, and is consequently an invention in its own right. - FIGS. 4, 5 illustrate a second type of mould in the open condition and in the closed condition. In this case, the space comprised between the two ring-shaped
cores 14 is occupied by a third ring-shapedcore 17, also made of high thermal dilating material, for example PTFE. - Finally, FIG. 10 shows the case of a rim with asymmetrical cross-section obtained according to the principles of the present invention. In this case the layers of fibre fabric material include first layers A extending so as to contribute to define the inner wall, the side walls and the two wings of the rim, second layers B arranged so as to contribute to define the inner, side and outer walls of the rim, third layers C arranged to define the outer wall and the two wings of the rim, and fourth layers D wound to fill the side regions of the outer wall of the rim from which the wings depart.
- Naturally, numerous changes can be implemented to the construction and forms of embodiment of the invention herein envisaged, all comprised within the context of the concept characterising this invention, as defined by the following claims.
Claims (53)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US10/815,585 US7258402B2 (en) | 2001-02-13 | 2004-04-01 | Method for producing a bicycle wheel rim, apparatus for implementing the method and bicycle wheel rim obtained thereby |
US11/739,814 US7651654B2 (en) | 2001-02-13 | 2007-04-25 | Method for producing a bicycle wheel rim, apparatus for implementing the method and bicycle wheel rim obtained thereby |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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ITTO2001A000121 | 2001-02-13 | ||
IT2001TO000121A ITTO20010121A1 (en) | 2001-02-13 | 2001-02-13 | PROCEDURE FOR THE MANUFACTURE OF A BICYCLE WHEEL RIM, DEVICE FOR THE IMPLEMENTATION OF THE PROCEDURE, AND THE CIRCLE SO OBTAINED |
ITTO2001A0121 | 2001-02-13 |
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Application Number | Title | Priority Date | Filing Date |
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US10/815,585 Continuation-In-Part US7258402B2 (en) | 2001-02-13 | 2004-04-01 | Method for producing a bicycle wheel rim, apparatus for implementing the method and bicycle wheel rim obtained thereby |
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US (1) | US6761847B2 (en) |
EP (1) | EP1231077B2 (en) |
JP (2) | JP4191413B2 (en) |
CN (1) | CN1298528C (en) |
AT (1) | ATE327907T1 (en) |
AU (1) | AU783315B2 (en) |
CZ (1) | CZ304842B6 (en) |
DE (1) | DE60211765T3 (en) |
IT (1) | ITTO20010121A1 (en) |
MX (1) | MXPA02001549A (en) |
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Also Published As
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JP2002307903A (en) | 2002-10-23 |
US6761847B2 (en) | 2004-07-13 |
EP1231077B1 (en) | 2006-05-31 |
AU783315B2 (en) | 2005-10-13 |
EP1231077A3 (en) | 2004-05-19 |
DE60211765T3 (en) | 2016-01-14 |
CN1370693A (en) | 2002-09-25 |
EP1231077B2 (en) | 2015-08-26 |
ITTO20010121A1 (en) | 2002-08-13 |
JP5166150B2 (en) | 2013-03-21 |
TW544405B (en) | 2003-08-01 |
EP1231077A2 (en) | 2002-08-14 |
JP2008280039A (en) | 2008-11-20 |
DE60211765D1 (en) | 2006-07-06 |
AU1559502A (en) | 2002-08-15 |
ATE327907T1 (en) | 2006-06-15 |
CZ2002513A3 (en) | 2002-10-16 |
DE60211765T2 (en) | 2006-10-19 |
ITTO20010121A0 (en) | 2001-02-13 |
JP4191413B2 (en) | 2008-12-03 |
CN1298528C (en) | 2007-02-07 |
CZ304842B6 (en) | 2014-12-03 |
MXPA02001549A (en) | 2004-11-01 |
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